NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
Table 5-1 Fault Repair Procedure Quick Reference (Continued)
FAULTY ITEM FAULTY SITUATION REFERENCE SECTION
Speech System Fault
Faults related to speech.
Section 4.5.2, Speech Path System
Fault - Fault Related to Speech
Dial tone is not heard.
Section 4.5.3, Speech Path System
Fault - When Dial Tone (DT)
Cannot Be Heard
STBY side is faulty.
Section 4.5.4, Speech Path System
Fault - STBY Side Has Become
Fault
Control System Fault
Fault occurs occasionally
at the ACT side.
Section 4.7.1, Control System Fault
- Fault Occurs Intermittently on
ACT side
Alarm Indication Fault
Fault is not detected.
Section 4.8.1, Fault That Cannot Be
Detected
Power Supply Fault
Fuse for RGU/-48V has blown. Section 4.9.2, Fuse Blown Fault
The circuit breaker of PWR supply is off.
Section 4.9.3, Circuit Breaker OFF
Fault in PWR Supply
Alarm lamp on the PWR supply is lit.
Section 4.9.4, Fault of Alarm Lamps
on PWR Supply
Fan Unit Fault
• Fans are not activated even if the temperature has ris-
en higher than a predetermined degree.
• Fans are not activated even if the FAN START switch
is set to AUTO position.
Section 5-23, Circuit Diagram of
Fan Unit and Thermal Unit
Tone Fault Tone is distorted. Section 4.11.2, Tone Fault
CCIS Line Fault
• A specific CCH/CCT card is faulty. When the signal
transmission line is a digital line, transmission/re-
ceiving of control signals cannot be performed.
• When the signal transmission line is an analog line,
transmission/receiving of control signals cannot be
performed.
Section 4.12.3, Specific CCH/CCT
Card Is Faulty
and
Section 4.12.4, Fault of CCH, DTI
and Related Flat Cable
ISDN Line Fault
• A specific DCH/PRT card is faulty.
• When the signal transmission line is a digital line,
transmission/receiving of control signals cannot be
performed.
Section 4.13.3, Specific DCH/PRT
Card Is Faulty
and
Section 4.13.4, Fault of DCH, DTI,
and Related Flat Cable